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    <title>绘制积分</title>


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    <p>
        $$ F(u,v) = \int_{-\infty}^{+\infty} \int_{-\infty}^{+\infty} (x^2y^3+x^3y^4) e^{-j2\pi(ux+vy)} dxdy $$
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    <p>
        $$
        \begin{bmatrix}
            x_1 & x_4 & x_7 \\
            x_2 & x_5 & x_8 \\
            x_3 & x_6 & x_9 \\
            x_4 & x_7 & x_1 \\
            x_5 & x_8 & x_2 \\
            x_6 & x_9 & x_3 
        \end{bmatrix}
        \begin{bmatrix}
            x_1 & x_2 & x_3 & x_4 & x_5 & x_6 \\
            x_4 & x_5 & x_6 & x_7 & x_8 & x_9 \\
            x_7 & x_8 & x_9 & x_1 & x_2 & x_3
        \end{bmatrix}
         =  \begin{bmatrix}
             x_1 & x_4 & x_7 \\
             x_2 & x_5 & x_8 \\
             x_3 & x_6 & x_9
            \end{bmatrix}
        $$
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